Update BlockchainService.js

pi-nexus-blockchain/services/BlockchainService.js

@@ -1,25 +1,92 @@
 import Web3 from 'web3';
+import { NETWORK_ID, GAS_PRICE, GAS_LIMIT } from '../utils/constants';
+import { BlockchainError } from '../utils/errors';
 
 class BlockchainService {
   constructor() {
-    this.web3 = new Web3(new Web3.providers.HttpProvider('https://mainnet.infura.io/v3/YOUR_PROJECT_ID'));
+    this.web3 = new Web3(new Web3.providers.HttpProvider(`https://mainnet.infura.io/v3/YOUR_PROJECT_ID`));
   }
 
+  /**
+   * Get the current block number
+   * @returns {Promise<number>} The current block number
+   */
   async getBlockNumber() {
     try {
       const blockNumber = await this.web3.eth.getBlockNumber();
       return blockNumber;
     } catch (error) {
-      throw new Error(`Failed to get block number: ${error.message}`);
+      throw new BlockchainError(`Failed to get block number: ${error.message}`);
     }
   }
 
+  /**
+   * Get the transaction count for a given address
+   * @param {string} address The address to get the transaction count for
+   * @returns {Promise<number>} The transaction count for the given address
+   */
   async getTransactionCount(address) {
     try {
       const txCount = await this.web3.eth.getTransactionCount(address);
       return txCount;
     } catch (error) {
-      throw new Error(`Failed to get transaction count: ${error.message}`);
+      throw new BlockchainError(`Failed to get transaction count: ${error.message}`);
+    }
+  }
+
+  /**
+   * Get the balance of a given address
+   * @param {string} address The address to get the balance for
+   * @returns {Promise<string>} The balance of the given address in wei
+   */
+  async getBalance(address) {
+    try {
+      const balance = await this.web3.eth.getBalance(address);
+      return balance;
+    } catch (error) {
+      throw new BlockchainError(`Failed to get balance: ${error.message}`);
+    }
+  }
+
+  /**
+   * Send a transaction to the blockchain
+   * @param {string} from The address to send the transaction from
+   * @param {string} to The address to send the transaction to
+   * @param {string} value The value to send in wei
+   * @param {string} gasPrice The gas price to use in wei
+   * @param {string} gasLimit The gas limit to use
+   * @returns {Promise<string>} The transaction hash
+   */
+  async sendTransaction(from, to, value, gasPrice = GAS_PRICE, gasLimit = GAS_LIMIT) {
+    try {
+      const txCount = await this.getTransactionCount(from);
+      const tx = {
+        from,
+        to,
+        value,
+        gas: gasLimit,
+        gasPrice,
+        nonce: txCount,
+      };
+      const signedTx = await this.web3.eth.accounts.signTransaction(tx, '0x...privateKey...');
+      const receipt = await this.web3.eth.sendSignedTransaction(signedTx.rawTransaction);
+      return receipt.transactionHash;
+    } catch (error) {
+      throw new BlockchainError(`Failed to send transaction: ${error.message}`);
+    }
+  }
+
+  /**
+   * Get the transaction receipt for a given transaction hash
+   * @param {string} transactionHash The transaction hash to get the receipt for
+   * @returns {Promise<object>} The transaction receipt
+   */
+  async getTransactionReceipt(transactionHash) {
+    try {
+      const receipt = await this.web3.eth.getTransactionReceipt(transactionHash);
+      return receipt;
+    } catch (error) {
+      throw new BlockchainError(`Failed to get transaction receipt: ${error.message}`);
     }
   }
 }